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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">close_edges_length</span><span data-if="c" style="display:none;">close_edges_length</span><span data-if="cpp" style="display:none;">CloseEdgesLength</span><span data-if="dotnet" style="display:none;">CloseEdgesLength</span><span data-if="python" style="display:none;">close_edges_length</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">close_edges_length</span><span data-if="c" style="display:none;">close_edges_length</span><span data-if="cpp" style="display:none;">CloseEdgesLength</span><span data-if="dotnet" style="display:none;">CloseEdgesLength</span><span data-if="python" style="display:none;">close_edges_length</span></code> — Close edge gaps using the edge amplitude image.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>close_edges_length</b>(<a href="#Edges"><i>Edges</i></a>, <a href="#Gradient"><i>Gradient</i></a> : <a href="#ClosedEdges"><i>ClosedEdges</i></a> : <a href="#MinAmplitude"><i>MinAmplitude</i></a>, <a href="#MaxGapLength"><i>MaxGapLength</i></a> : )</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>close_edges_length</b>(const Hobject <a href="#Edges"><i>Edges</i></a>, const Hobject <a href="#Gradient"><i>Gradient</i></a>, Hobject* <a href="#ClosedEdges"><i>ClosedEdges</i></a>, const Hlong <a href="#MinAmplitude"><i>MinAmplitude</i></a>, const Hlong <a href="#MaxGapLength"><i>MaxGapLength</i></a>)</code></p>
<p>
<code>Herror <b>T_close_edges_length</b>(const Hobject <a href="#Edges"><i>Edges</i></a>, const Hobject <a href="#Gradient"><i>Gradient</i></a>, Hobject* <a href="#ClosedEdges"><i>ClosedEdges</i></a>, const Htuple <a href="#MinAmplitude"><i>MinAmplitude</i></a>, const Htuple <a href="#MaxGapLength"><i>MaxGapLength</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>CloseEdgesLength</b>(const HObject&amp; <a href="#Edges"><i>Edges</i></a>, const HObject&amp; <a href="#Gradient"><i>Gradient</i></a>, HObject* <a href="#ClosedEdges"><i>ClosedEdges</i></a>, const HTuple&amp; <a href="#MinAmplitude"><i>MinAmplitude</i></a>, const HTuple&amp; <a href="#MaxGapLength"><i>MaxGapLength</i></a>)</code></p>
<p>
<code><a href="HRegion.html">HRegion</a> <a href="HRegion.html">HRegion</a>::<b>CloseEdgesLength</b>(const HImage&amp; <a href="#Gradient"><i>Gradient</i></a>, Hlong <a href="#MinAmplitude"><i>MinAmplitude</i></a>, Hlong <a href="#MaxGapLength"><i>MaxGapLength</i></a>) const</code></p>
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<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>CloseEdgesLength</b>(<a href="HObject.html">HObject</a> <a href="#Edges"><i>edges</i></a>, <a href="HObject.html">HObject</a> <a href="#Gradient"><i>gradient</i></a>, out <a href="HObject.html">HObject</a> <a href="#ClosedEdges"><i>closedEdges</i></a>, <a href="HTuple.html">HTuple</a> <a href="#MinAmplitude"><i>minAmplitude</i></a>, <a href="HTuple.html">HTuple</a> <a href="#MaxGapLength"><i>maxGapLength</i></a>)</code></p>
<p>
<code><a href="HRegion.html">HRegion</a> <a href="HRegion.html">HRegion</a>.<b>CloseEdgesLength</b>(<a href="HImage.html">HImage</a> <a href="#Gradient"><i>gradient</i></a>, int <a href="#MinAmplitude"><i>minAmplitude</i></a>, int <a href="#MaxGapLength"><i>maxGapLength</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>close_edges_length</b>(<a href="#Edges"><i>edges</i></a>: HObject, <a href="#Gradient"><i>gradient</i></a>: HObject, <a href="#MinAmplitude"><i>min_amplitude</i></a>: int, <a href="#MaxGapLength"><i>max_gap_length</i></a>: int) -&gt; HObject</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">close_edges_length</span><span data-if="c" style="display:none">close_edges_length</span><span data-if="cpp" style="display:none">CloseEdgesLength</span><span data-if="com" style="display:none">CloseEdgesLength</span><span data-if="dotnet" style="display:none">CloseEdgesLength</span><span data-if="python" style="display:none">close_edges_length</span></code> closes gaps in the output of an edge
detector, and thus tries to produce complete object contours.  This
operator expects as input the edges (<a href="#Edges"><i><code><span data-if="hdevelop" style="display:inline">Edges</span><span data-if="c" style="display:none">Edges</span><span data-if="cpp" style="display:none">Edges</span><span data-if="com" style="display:none">Edges</span><span data-if="dotnet" style="display:none">edges</span><span data-if="python" style="display:none">edges</span></code></i></a>) and amplitude
image (<a href="#Gradient"><i><code><span data-if="hdevelop" style="display:inline">Gradient</span><span data-if="c" style="display:none">Gradient</span><span data-if="cpp" style="display:none">Gradient</span><span data-if="com" style="display:none">Gradient</span><span data-if="dotnet" style="display:none">gradient</span><span data-if="python" style="display:none">gradient</span></code></i></a>) returned by typical edge operators,
such as <a href="edges_image.html"><code><span data-if="hdevelop" style="display:inline">edges_image</span><span data-if="c" style="display:none">edges_image</span><span data-if="cpp" style="display:none">EdgesImage</span><span data-if="com" style="display:none">EdgesImage</span><span data-if="dotnet" style="display:none">EdgesImage</span><span data-if="python" style="display:none">edges_image</span></code></a> or <a href="sobel_amp.html"><code><span data-if="hdevelop" style="display:inline">sobel_amp</span><span data-if="c" style="display:none">sobel_amp</span><span data-if="cpp" style="display:none">SobelAmp</span><span data-if="com" style="display:none">SobelAmp</span><span data-if="dotnet" style="display:none">SobelAmp</span><span data-if="python" style="display:none">sobel_amp</span></code></a>.
</p>
<p>Contours are closed in two steps: First, one pixel wide gaps in the
input contours are closed, and isolated points are eliminated.  After
this, open contours are extended by up to <a href="#MaxGapLength"><i><code><span data-if="hdevelop" style="display:inline">MaxGapLength</span><span data-if="c" style="display:none">MaxGapLength</span><span data-if="cpp" style="display:none">MaxGapLength</span><span data-if="com" style="display:none">MaxGapLength</span><span data-if="dotnet" style="display:none">maxGapLength</span><span data-if="python" style="display:none">max_gap_length</span></code></i></a>
points by adding edge points until either the contour is closed or
no more significant edge points can be found.  A gradient is
regarded as significant if it is larger than
<a href="#MinAmplitude"><i><code><span data-if="hdevelop" style="display:inline">MinAmplitude</span><span data-if="c" style="display:none">MinAmplitude</span><span data-if="cpp" style="display:none">MinAmplitude</span><span data-if="com" style="display:none">MinAmplitude</span><span data-if="dotnet" style="display:none">minAmplitude</span><span data-if="python" style="display:none">min_amplitude</span></code></i></a>.  The neighboring points examined as
possible new edge points are the point in the direction of the
contour and its two adjacent points in an 8-neighborhood.  For each
of these points, the sum of its gradient and the maximum gradient of
that points three possible neighbors is calculated (look
ahead of length 1).  The point with the maximum
sum is then chosen as the new edge point.</p>
<h2 id="sec_attention">注意</h2>
<p>Note that filter operators may return unexpected results if
an image with a reduced domain is used as input. Please refer to the
chapter <a href="toc_filters.html">过滤器</a>.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>在元组级别自动并行化。</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Edges" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Edges</span><span data-if="c" style="display:none">Edges</span><span data-if="cpp" style="display:none">Edges</span><span data-if="com" style="display:none">Edges</span><span data-if="dotnet" style="display:none">edges</span><span data-if="python" style="display:none">edges</span></code></b> (input_object)  </span><span>region(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="c" style="display:none">Hobject</span></span>
</div>
<p class="pardesc">Region containing one pixel thick edges.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Gradient" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Gradient</span><span data-if="c" style="display:none">Gradient</span><span data-if="cpp" style="display:none">Gradient</span><span data-if="com" style="display:none">Gradient</span><span data-if="dotnet" style="display:none">gradient</span><span data-if="python" style="display:none">gradient</span></code></b> (input_object)  </span><span>singlechannelimage <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (byte / uint2)</span>
</div>
<p class="pardesc">Edge amplitude (gradient) image.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ClosedEdges" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ClosedEdges</span><span data-if="c" style="display:none">ClosedEdges</span><span data-if="cpp" style="display:none">ClosedEdges</span><span data-if="com" style="display:none">ClosedEdges</span><span data-if="dotnet" style="display:none">closedEdges</span><span data-if="python" style="display:none">closed_edges</span></code></b> (output_object)  </span><span>region(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="c" style="display:none">Hobject *</span></span>
</div>
<p class="pardesc">Region containing closed edges.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="MinAmplitude" class="parname"><b><code><span data-if="hdevelop" style="display:inline">MinAmplitude</span><span data-if="c" style="display:none">MinAmplitude</span><span data-if="cpp" style="display:none">MinAmplitude</span><span data-if="com" style="display:none">MinAmplitude</span><span data-if="dotnet" style="display:none">minAmplitude</span><span data-if="python" style="display:none">min_amplitude</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimum edge amplitude.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>16</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>5, 8, 10, 12, 16, 20, 25, 30, 40, 50</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">MinAmplitude</span>
    <span data-if="c" style="display:none">MinAmplitude</span>
    <span data-if="cpp" style="display:none">MinAmplitude</span>
    <span data-if="com" style="display:none">MinAmplitude</span>
    <span data-if="dotnet" style="display:none">minAmplitude</span>
    <span data-if="python" style="display:none">min_amplitude</span>
    
          ≤
          255</code></p>
<p class="pardesc"><span class="parcat">Minimum increment:
      </span>1</p>
<p class="pardesc"><span class="parcat">Recommended increment:
      </span>1</p>
</div>
  <div class="par">
<div class="parhead">
<span id="MaxGapLength" class="parname"><b><code><span data-if="hdevelop" style="display:inline">MaxGapLength</span><span data-if="c" style="display:none">MaxGapLength</span><span data-if="cpp" style="display:none">MaxGapLength</span><span data-if="com" style="display:none">MaxGapLength</span><span data-if="dotnet" style="display:none">maxGapLength</span><span data-if="python" style="display:none">max_gap_length</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Maximal number of points by which edges are extended.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>3</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 30, 40, 50, 70, 100</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>1
          ≤
        
    <span data-if="hdevelop" style="display:inline">MaxGapLength</span>
    <span data-if="c" style="display:none">MaxGapLength</span>
    <span data-if="cpp" style="display:none">MaxGapLength</span>
    <span data-if="com" style="display:none">MaxGapLength</span>
    <span data-if="dotnet" style="display:none">maxGapLength</span>
    <span data-if="python" style="display:none">max_gap_length</span>
    
          ≤
          127</code></p>
<p class="pardesc"><span class="parcat">Minimum increment:
      </span>1</p>
<p class="pardesc"><span class="parcat">Recommended increment:
      </span>1</p>
</div>
<h2 id="sec_example_all">例程 (C)</h2>
<pre class="example">
sobel_amp(Image,&amp;EdgeAmp,"sum_abs",5);
threshold(EdgeAmp,&amp;EdgeRegion,40.0,255.0);
skeleton(EdgeRegion,&amp;ThinEdge);
close_edges_length(ThinEdge,EdgeAmp,&amp;CloseEdges,15,3);
</pre>
<h2 id="sec_result">结果</h2>
<p><code><span data-if="hdevelop" style="display:inline">close_edges_length</span><span data-if="c" style="display:none">close_edges_length</span><span data-if="cpp" style="display:none">CloseEdgesLength</span><span data-if="com" style="display:none">CloseEdgesLength</span><span data-if="dotnet" style="display:none">CloseEdgesLength</span><span data-if="python" style="display:none">close_edges_length</span></code> returns <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
     if all parameters are
correct.  If the input is empty the behavior can be set via
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('no_object_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.  If
necessary, an exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="edges_image.html"><span data-if="hdevelop" style="display:inline">edges_image</span><span data-if="c" style="display:none">edges_image</span><span data-if="cpp" style="display:none">EdgesImage</span><span data-if="com" style="display:none">EdgesImage</span><span data-if="dotnet" style="display:none">EdgesImage</span><span data-if="python" style="display:none">edges_image</span></a></code>, 
<code><a href="sobel_amp.html"><span data-if="hdevelop" style="display:inline">sobel_amp</span><span data-if="c" style="display:none">sobel_amp</span><span data-if="cpp" style="display:none">SobelAmp</span><span data-if="com" style="display:none">SobelAmp</span><span data-if="dotnet" style="display:none">SobelAmp</span><span data-if="python" style="display:none">sobel_amp</span></a></code>, 
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>, 
<code><a href="skeleton.html"><span data-if="hdevelop" style="display:inline">skeleton</span><span data-if="c" style="display:none">skeleton</span><span data-if="cpp" style="display:none">Skeleton</span><span data-if="com" style="display:none">Skeleton</span><span data-if="dotnet" style="display:none">Skeleton</span><span data-if="python" style="display:none">skeleton</span></a></code>
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="close_edges.html"><span data-if="hdevelop" style="display:inline">close_edges</span><span data-if="c" style="display:none">close_edges</span><span data-if="cpp" style="display:none">CloseEdges</span><span data-if="com" style="display:none">CloseEdges</span><span data-if="dotnet" style="display:none">CloseEdges</span><span data-if="python" style="display:none">close_edges</span></a></code>, 
<code><a href="dilation1.html"><span data-if="hdevelop" style="display:inline">dilation1</span><span data-if="c" style="display:none">dilation1</span><span data-if="cpp" style="display:none">Dilation1</span><span data-if="com" style="display:none">Dilation1</span><span data-if="dotnet" style="display:none">Dilation1</span><span data-if="python" style="display:none">dilation1</span></a></code>, 
<code><a href="closing.html"><span data-if="hdevelop" style="display:inline">closing</span><span data-if="c" style="display:none">closing</span><span data-if="cpp" style="display:none">Closing</span><span data-if="com" style="display:none">Closing</span><span data-if="dotnet" style="display:none">Closing</span><span data-if="python" style="display:none">closing</span></a></code>
</p>
<h2 id="sec_references">References</h2>
<p>

M. Üsbeck: “Untersuchungen zur echtzeitfähigen Segmentierung”;
Studienarbeit, Bayerisches Forschungszentrum für Wissensbasierte
Systeme (FORWISS), Erlangen, 1993.
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
<!--OP_REF_FOOTER_START-->
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